Accession Number : AD0660410

Title :   AUTODYNE TRANSDUCERS OF SIGNALS OF NUCLEAR MAGNETIC RESONANCE,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Dekabrun,L. L. ; Kilyanov,Ya. N. ; Mkrtchyan,A. R.

Report Date : 18 AUG 1967

Pagination or Media Count : 18

Abstract : An analysis is presented of the stabilizing action of active negative feedback on autodyne pickups for the investigation of solids by the NMR method. In such applications, autodyne pickups have certain advantages over others, but must be stabilized when the signal voltage is low, such as is the case with solid-state NMR. The transients in an autodyne pickup with stabilized amplitude are calculated, and the modifications that must be introduced in the pickup circuit to ensure stability are described. Empirical means of selecting the autodyne circuit and its parts to obtain maximum sensitivity are suggested, since a theoretical analysis of this problem is impossible. A schematic diagram of a pickup with stable operation at less than 0.005 volt on the resonant circuit is presented. This circuit has been thoroughly tested and proved itself in practical investigations of several natural compounds by the NMR method. (Author)

Descriptors :   (*NUCLEAR MAGNETIC RESONANCE, INSTRUMENTATION), MICROWAVE SPECTROSCOPY, TRANSDUCERS, CIRCUITS, OSCILLATORS, AMPLIFIERS, USSR

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE